mysql中my.cnf的一个配置文件

# Example MySQL config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MySQL plays
# an important part, or systems up to 128M where MySQL is used together with
# other programs (such as a web server)
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MySQL clients
[client]
#password       = your_password
port            = 3306
socket          = /tmp/mysqld.sock
#default-character-set=utf8
# Here follows entries for some specific programs
"/opt/mysql/etc/my.cnf" 162L, 6528C
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout
"/opt/mysql/etc/my.cnf" 162L, 6528C written
[root@SR3 ~]# more /etc/my.cnf
/etc/my.cnf: No such file or directory
[root@SR3 ~]#
[root@SR3 ~]#
[root@SR3 ~]# more /opt/mysql/etc/my.cnf
# Example MySQL config file for medium systems.
#
# This is for a system with little memory (32M - 64M) where MySQL plays
# an important part, or systems up to 128M where MySQL is used together with
# other programs (such as a web server)
#
# MySQL programs look for option files in a set of
# locations which depend on the deployment platform.
# You can copy this option file to one of those
# locations. For information about these locations, see:
# http://dev.mysql.com/doc/mysql/en/option-files.html
#
# In this file, you can use all long options that a program supports.
# If you want to know which options a program supports, run the program
# with the "--help" option.

# The following options will be passed to all MySQL clients
[client]
#password       = your_password
port            = 3306
socket          = /tmp/mysqld.sock
#default-character-set=utf8
# Here follows entries for some specific programs

# The MySQL server
[mysqld]
port            = 3306
socket          = /tmp/mysqld.sock
skip-external-locking
long_query_time=5
log-slow-queries= /mysqldata/slowquery.log
character_set_server=utf8
default-storage-engine=MyISAM
#have_partition_engine=yes
max_connections =3000 #最大连接数
sort_buffer_size = 16M #在排序发生时由每个线程分配
join_buffer_size = 16M #当全联合发生时，在每个线程分配
query_cache_size = 512M #查询缓冲，可以提高服务器速度
query_cache_limit=100M #只有小于此值的结果才会被缓冲，此设置用来保护查询缓冲，防止一个极大的结果集将其他所有的查询结果都覆盖
tmp_table_size=10M #内部(内存中)临时表的最大大小，如果一个表增长到此值更大，将会自动转换为基于磁盘的表,此限制是针对单个表的，而不是
总和
key_buffer_size=256M #关键词缓冲大小，一般用于缓冲MyISAM表的索引块，不要将其设置大于你可用内存的30%，因为一部分内存同样被OS用来缓冲
行数据，甚至在你并不使用MyISAM表的情况下，你也需要仍旧设置起8-64M内存由于它同样会被内部临时磁盘表使用
#key_buffer_size = 16M
read_buffer_size=32M  #用来做MyISAM表全表扫描的缓冲大小，当全表扫描需要时，在对应线程中分配
read_rnd_buffer_size=64 #当在排序之后,从一个已经排序好的序列中读取行时,行数据将从这个缓冲中读取来防止磁盘寻道.如果你增高此值,可以提
高很多ORDER BY的性能.当需要时由每个线程分配
bulk_insert_buffer_size = 128M #MyISAM 使用特殊的类似树的cache来使得突发插入,(这些插入是,INFILE) 更快. 此变量限制每个进程中缓冲树的
字节数.设置为 0 会关闭此优化,为了最优化不要将此值设置大于 “key_buffer_size”.
max_allowed_packet = 1M
table_open_cache = 64
#sort_buffer_size = 512K
net_buffer_length = 8K
read_buffer_size = 256K
read_rnd_buffer_size = 512K
myisam_sort_buffer_size = 8M
# Don't listen on a TCP/IP port at all. This can be a security enhancement,
# if all processes that need to connect to mysqld run on the same host.
# All interaction with mysqld must be made via Unix sockets or named pipes.
# Note that using this option without enabling named pipes on Windows
# (via the "enable-named-pipe" option) will render mysqld useless!
#
#skip-networking

# Replication Master Server (default)
# binary logging is required for replication
log-bin=mysqlSR3-bin
log-bin-index=mysql-bin
expire-logs-days=10
binlog-cache-size=102400000
max-binlog-size=204800000
max-binlog-size=1024000
# binary logging format - mixed recommended
binlog_format=mixed

# required unique id between 1 and 2^32 - 1
# defaults to 1 if master-host is not set
# but will not function as a master if omitted
server-id       = 1

# Replication Slave (comment out master section to use this)
#
# To configure this host as a replication slave, you can choose between
# two methods :
#
# 1) Use the CHANGE MASTER TO command (fully described in our manual) -
#    the syntax is:
#
#    CHANGE MASTER TO MASTER_HOST=<host>, MASTER_PORT=<port>,
#    MASTER_USER=<user>, MASTER_PASSWORD=<password> ;
#
#    where you replace <host>, <user>, <password> by quoted strings and
#    <port> by the master's port number (3306 by default).
#
#    Example:
#
#    CHANGE MASTER TO MASTER_HOST='125.564.12.1', MASTER_PORT=3306,
#    MASTER_USER='joe', MASTER_PASSWORD='secret';
#
# OR
#
# 2) Set the variables below. However, in case you choose this method, then
#    start replication for the first time (even unsuccessfully, for example
#    if you mistyped the password in master-password and the slave fails to
#    connect), the slave will create a master.info file, and any later
#    change in this file to the variables' values below will be ignored and
#    overridden by the content of the master.info file, unless you shutdown
#    the slave server, delete master.info and restart the slaver server.
#    For that reason, you may want to leave the lines below untouched
#    (commented) and instead use CHANGE MASTER TO (see above)
#
# required unique id between 2 and 2^32 - 1
# (and different from the master)
# defaults to 2 if master-host is set
# but will not function as a slave if omitted
#server-id       = 2
#
# The replication master for this slave - required
#master-host     =   <hostname>
#
# The username the slave will use for authentication when connecting
# to the master - required
#master-user     =   <username>
#
# The password the slave will authenticate with when connecting to
# the master - required
#master-password =   <password>
#
# The port the master is listening on.
# optional - defaults to 3306
#master-port     =  <port>
#
# binary logging - not required for slaves, but recommended
#log-bin=mysql-bin

# Uncomment the following if you are using InnoDB tables
#innodb_data_home_dir = /mysqldata
#innodb_data_file_path = ibdata1:10M:autoextend
#innodb_log_group_home_dir = /mysqldata
# You can set .._buffer_pool_size up to 50 - 80 %
# of RAM but beware of setting memory usage too high
#innodb_buffer_pool_size = 16M
#innodb_additional_mem_pool_size = 2M
# Set .._log_file_size to 25 % of buffer pool size
#innodb_log_file_size = 5M
#innodb_log_buffer_size = 8M
#innodb_flush_log_at_trx_commit = 1
#innodb_lock_wait_timeout = 50

[mysqldump]
quick
max_allowed_packet = 16M

[mysql]
no-auto-rehash
# Remove the next comment character if you are not familiar with SQL
#safe-updates

[myisamchk]
key_buffer_size = 20M
sort_buffer_size = 20M
read_buffer = 2M
write_buffer = 2M

[mysqlhotcopy]
interactive-timeout